题目内容
(2011?铁山港区模拟)下面各题怎样算简便就怎样算
|
|
(
|
分析:(1)把除号变乘号,再运用乘法的分配律进行计算即可.
(2)直接运用乘法的分配律进行计算即可.
(3)计算(
+
)×7运用乘法的分配律进行计算即可,进一步求出答案即可.
(2)直接运用乘法的分配律进行计算即可.
(3)计算(
| 3 |
| 7 |
| 3 |
| 5 |
解答:解:(1)
×16-2÷
,
=
×16-2×
,
=
×(16-2),
=
×14,
=10;
(2)
×(
-
),
=
×
-
×
,
=
-
,
=2;
(3)(
+
)×7+
,
=7×
+
×7+
,
=3+
+
,
=3+(
+
),
=3+5,
=8.
| 5 |
| 7 |
| 7 |
| 5 |
=
| 5 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
=10;
(2)
| 12 |
| 13 |
| 5 |
| 2 |
| 1 |
| 3 |
=
| 12 |
| 13 |
| 5 |
| 2 |
| 12 |
| 13 |
| 1 |
| 3 |
=
| 30 |
| 13 |
| 4 |
| 13 |
=2;
(3)(
| 3 |
| 7 |
| 3 |
| 5 |
| 4 |
| 5 |
=7×
| 3 |
| 7 |
| 3 |
| 5 |
| 4 |
| 5 |
=3+
| 21 |
| 5 |
| 4 |
| 5 |
=3+(
| 21 |
| 5 |
| 4 |
| 5 |
=3+5,
=8.
点评:本题根据数值的特点,灵活的运用运算定律进行解答即可.
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